Variable track joystick devices and work vehicles containing the same

ABSTRACT

A variable track joystick device includes a support housing, a joystick movable with respect to the support housing, and a joystick guidance mechanism controllable to selectively confine joystick movement to a predetermined track pattern. During operation of the variable joystick device, a controller determines when the variable track joystick device is placed in a selected one of (i) a first mode in which joystick movement controls the first work vehicle function and (ii) a second mode in which joystick movement controls the second work vehicle function. The controller further commands the joystick guidance mechanism to restrict joystick movement to the predetermined track pattern when the joystick device is placed in the first mode, while permitting joystick movement outside of the predetermined track pattern when the joystick device is placed in the second mode.

CROSS-REFERENCE TO RELATED APPLICATION(S)

Not applicable.

STATEMENT OF FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

FIELD OF THE DISCLOSURE

This disclosure relates to variable track joystick devices for usage incontrolling multiple functions of a work vehicle, such as a tractor.

Abbreviations

Abbreviations appearing relatively infrequently in this document aredefined upon initial usage, while abbreviations appearing morefrequently in this document are defined below:

DOF—degree of freedom;

FEL—front end loader;

Multi-DOF—multiple degrees of freedom; and

ROM—range of motion.

BACKGROUND OF THE DISCLOSURE

Certain work vehicles are equipped with multiple joystick devices, witheach joystick device utilized to control a different function of thework vehicle. Such joystick devices may differ not only in form andfunction, but may further include joysticks movable through distinctROMs. Consider, for example, a tractor equipped with ajoystick-controlled FEL system or assembly. At least two joystickdevices may be located within the operator station or cabin of such anFEL-equipped tractor: a first joystick device utilized to control thetractor's transmission, and a second joystick device utilized to controlFEL movement. The first (transmission-dedicated) joystick device, forexample, adjust the speed and direction in which the tractor travels.The second (FEL-dedicated) joystick device may control the height andtilt angle of the FEL bucket. Other types of work vehicles are likewiseequipped with multiple joystick devices for controlling different workvehicle functions, such as the movement of boom-mounted implements forperforming various tasks in the agricultural, mining, forestry, andconstruction industries.

SUMMARY OF THE DISCLOSURE

A variable track joystick device is provided for usage in controlling atleast first and second work vehicle functions. In embodiments, thevariable track joystick device includes a support housing, a joystickmovable with respect to the support housing, and a joystick guidancemechanism coupled to the support housing and controllable to selectivelyconfine joystick movement to a predetermined track pattern. A controlleris operably coupled to the joystick guidance mechanism. During operationof the joystick device, the controller determines when the variabletrack joystick device is placed in a selected one of: (i) a first modein which joystick movement controls the first work vehicle function, and(ii) a second mode in which joystick movement controls the second workvehicle function. The controller further commands the joystick guidancemechanism to restrict joystick movement to the predetermined trackpattern when the variable track joystick device is placed in the firstmode, while permitting joystick movement outside of the predeterminedtrack pattern when the variable track joystick device is placed in thesecond mode.

In other embodiments, the variable track joystick device includes asupport housing, a joystick having a joystick base located within thesupport housing and a joystick handle projecting from the supporthousing, and a coupling provided between the joystick base and thesupport housing. The coupling permits rotation of the joystick base overan ROM relative to the support housing about first and secondperpendicular axes. The variable track joystick device further containsa joystick guidance mechanism, which includes at least one guide memberand an actuator. The actuator is mechanically linked to the guide memberor members, which are coupled to the support housing and movablerelative to the joystick base. The actuator is controllable toselectively move the guide member or members between (i) a blockingposition in which the guide member or members encroach into the ROM ofthe joystick base to restrict joystick movement, and (ii) a non-blockingposition in which the guide member or members reside outside of the ROMof the joystick base.

Embodiments of a work vehicle equipped with a variable track joystickdevice are further provided. In an embodiment, the work vehicle includesa transmission, a work implement, and a variable track joystick device.The variable track joystick device includes, in turn, a support housing,a joystick movable with respect to the support housing, a joystickguidance mechanism coupled to the support housing and controllable toselectively confine joystick movement to a predetermined track pattern,and a controller operably coupled to the joystick guidance mechanism.The controller is configured to determine when the variable trackjoystick device is placed in a selected one of (i) a transmissioncontrol mode in which joystick movement controls functioning of thetransmission and (ii) a work implement control mode in which joystickmovement controls movement or other functioning of the work implement.The controller further commands the joystick guidance mechanism torestrict joystick movement to the predetermined track pattern when thevariable track joystick device is placed in the transmission controlmode, while permitting joystick movement outside of the predeterminedtrack pattern when the variable track joystick device is placed in thework implement control mode.

The details of one or more embodiments are set forth in the accompanyingdrawings and the description below. Other features and advantages willbecome apparent from the description, the drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

At least one example of the present disclosure will hereinafter bedescribed in conjunction with the following figures:

FIG. 1 is a side view of an example work vehicle (here, a tractor)having multiple functions suitably controlled utilizing an embodiment ofthe variable track joystick device;

FIG. 2 is a schematic of an example variable track joystick device andtwo work vehicle systems having functions suitably controlled utilizingthe joystick device, as usefully incorporated into the work vehicleshown in FIG. 1;

FIG. 3 is an isometric view of a simplified implementation of theexample variable track joystick device (partially shown) in a first modein which the joystick movement controls a first work vehicle function,such as operation of the transmission system shown in FIG. 2;

FIG. 4 is an isometric view of the variable track joystick device(partially shown) in a second mode in which the joystick movementcontrols a second work vehicle function, such as operation of the workimplement system (e.g., movement of the FEL bucket shown in FIG. 1);

FIGS. 5 and 6 are isometric views of the variable track joystick deviceshown in FIGS. 3 and 4 with the support housing hidden from view, asdepicted in the first and second modes, respectively;

FIGS. 7 and 8 are isometric view of an example joystick guidancemechanism included in the variable track joystick device shown in FIGS.3-6, as illustrated in a blocking position (corresponding to the firstmode) and a non-blocking position (corresponding to the second mode),respectively; and

FIGS. 9 and 10 schematically illustrate the different ROMs of theexample variable track joystick device shown in FIGS. 3-8 when thejoystick guidance mechanism is in the blocking position (correspondingto the first mode) and in the non-blocking position (corresponding tothe second mode), respectively.

Like reference symbols in the various drawings indicate like elements.For simplicity and clarity of illustration, descriptions and details ofwell-known features and techniques may be omitted to avoid unnecessarilyobscuring the example and non-limiting embodiments of the inventiondescribed in the subsequent Detailed Description. It should further beunderstood that features or elements appearing in the accompanyingfigures are not necessarily drawn to scale unless otherwise stated.

DETAILED DESCRIPTION

Embodiments of the present disclosure are shown in the accompanyingfigures of the drawings described briefly above. Various modificationsto the example embodiments may be contemplated by one of skill in theart without departing from the scope of the present invention, asset-forth the appended claims.

Overview

As briefly discussed above, work vehicles may be equipped with multiplejoystick devices for usage in controlling different work vehiclefunctions. The joystick devices may assume different forms, the buttonsor other inputs provided on the joystick devices may differ, and the ROMof the joystick included in a particular joystick device may vary inrelation to the work vehicle function controlled utilizing the joystickdevice. Such multi-joystick control schemes are well-established withinindustries employing work vehicles and provide a certain level ofsimplicity by associating each joystick device with control of aspecific work vehicle function. The inclusion of multiple differentjoystick devices within a single work vehicle is, however, associatedwith several drawbacks. The need to furnish two (or more)function-specific joystick devices, as well as their associatedinterconnections and supportive hardware, introduces additionalmanufacturing cost, part count, and complexity into the overallconstruction of a work vehicle operator station. Additionally, theprovision of multiple joystick devices, each including a joystick handlewithin comfortable reach of a human operator when seated within theoperator station of a work vehicle, can place undesired spatialconstraints on the layout of the joystick devices and other components(e.g., a center console, other input devices, etc.) within the operatorstation. As a still further drawback, requiring an operator torepeatedly transition between manipulating different joystick deviceswhen operating a work vehicle can detract from operator focus and lowerperformance levels.

To overcome the limitations set-forth above, the following describesunique joystick devices suitable for usage in controlling multiplefunctions of a work vehicle, while selectively limiting joystick ROM ina manner best suited for controlling a presently-activated work vehiclefunction. In this regard, embodiments of the below-described joystickdevice may selectively limit joystick movement to at least onepredetermined track pattern (herein, a “first fixed-track pattern”) whenthe joystick device operates in a first mode in which joystick movementcontrols a first function of a work vehicle. In contrast, joystickmovement is permitted outside of the first fixed-track pattern when thejoystick device is placed in a second mode in which joystick movementcontrols a second function of the work vehicle. The term “controls,” asappearing in this context, does not require that a particular workvehicle function is wholly controlled by joystick movement, rather onlythat an operator may move the joystick movement to adjust at least oneoperational aspect of the work vehicle function, as desired. The term“controls” is thus defined to encompass the term “help control”throughout this document. When placed in the second mode, the joystickdevice may permit movement over the full ROM permitted by the couplingformed between the joystick and a support housing of the joystickdevice; or, alternatively, may limit joystick movement in a differentmanner, such as by confining joystick movement to a second fixed-trackpattern. As the joystick device selectively confines joystick movementto at least one fixed-track pattern based on the operational mode, thejoystick device is referred to more fully herein as a “variable trackjoystick device.” Further, in certain embodiments, the joystick devicemay be operable in three or more modes, may be capable of selectingconfining joystick movement to any practical number of fixed-trackpatterns in addition to in lieu of selectively allowing joystickmovement over a full or open ROM in at least one operational mode.

Depending upon design, the fixed-track pattern (or patterns) to whichthe joystick device selectively limits joystick movement can include anynumber of tracks in which the joystick may travel when manipulated by anoperator. For example, in embodiments, the fixed-track pattern mayinclude at least two intersecting tracks, each having a linear or curvedgeometry. As a more specific example, the fixed-track pattern mayinclude or consist of two linear tracks, which intersect at a rightangle to form a plus-shaped or cruciform pattern. The linear tracks mayintersect at a centered or home position of the joystick, toward whichthe joystick may be biased utilizing, for example, one or more springs.In other embodiments, the fixed-track pattern may include one or moretracks having a more complex geometry, such as a stepped or sawtoothgeometry. Depending upon the width of a given track, joystick movementmay be confined to substantially bi-directional movement along thelength or centerline of the track in some implementations.Comparatively, when joystick movement is permitted over an open,maximum, or full ROM, the joystick may be moved in multiple DOFsregardless of joystick position, limited only by the coupling providedbetween the joystick and the support housing.

The work vehicle functions controlled utilizing the variable trackjoystick device will vary between embodiments depending upon a number offactors including, for example, the type of work vehicle into which thejoystick device is incorporated. To provide a useful, albeitnon-limiting example, the following will principally discuss embodimentsof the variable track joystick device in the context of a tractorequipped with a forward, boom-mounted work implement, namely, an FELbucket. In this instance, and as described below, the variable trackjoystick device may be utilized to control: (i) functional aspects ofthe tractor's transmission when the joystick device is placed in a firstmode and joystick movement is confined to a fixed-track pattern; and(ii) movement of the FEL bucket when the joystick device is placed in asecond mode in which joystick movement is permitted outside of (beyondthe bounds of) the fixed-track pattern. The following examplenotwithstanding, embodiments of the variable track joystick device arenot restricted to deployment within any particular type of work vehicle;nor are embodiments of the variable track joystick device restricted tousage in controlling any particular set of work vehicle functions.Rather, embodiments of the variable track joystick device can beutilized to control a wide range of work vehicle functions amenable tojoystick control including, but not limited to movement of other typesof boom-mounted work implements, such as the felling head of a fellerbuncher, the bucket (or other end effector) of an excavator, the bladeof a dozer, or another attachment (e.g., a bale spear) mounted to thefront end or rear end of a tractor, to list but a few examples.

Example of a Work Vehicle Having Multiple Functions Suitably ControlledUtilizing a Variable Track Joystick Device

FIG. 1 is a side view of a work vehicle (here, a tractor 20) having atleast two joystick-controlled work vehicle functions and illustrated inaccordance with an example embodiment of the present disclosure. Asappearing herein, the term “joystick-controlled function” refers to afunctionality or operational aspect of a work vehicle controlled, atleast in part, by movement of a joystick included in a joystick device.In the present example, the joystick-controlled functions of the tractor20 include at least: (i) control of certain operational aspects of atransmission contained in the tractor 20 and generically represented bydashed box 22 in FIG. 1, and (ii) control of certain operational aspectsof an FEL system 24 mounted to the front end of the tractor 20.Traditionally, such joystick-controlled functions are controlledutilizing a first joystick device dedicated to controlling the tractortransmission and a second, independent joystick device dedicated tocontrolling FEL movement. However, in accordance with embodiments of thepresent disclosure, both of the foregoing work vehicle functions arecontrolled, at least in part, utilizing a common variable track joystickdevice as described more fully below.

Discussing the tractor 20 in greater detail, the example tractor 20includes an operator station 26, such as an environmentally-sealedcabin, located above a wheeled vehicle chassis or tractor body 28. Awork implement 30, as included in the FEL system 24, is mounted to aforward portion of the tractor body 28 by a boom assembly 32 furtherincluded in the FEL system 24. In the illustrated example, the workimplement 30 assumes the form of a bucket and is consequently referredto as hereafter as the “FEL bucket 30.” The present examplenotwithstanding, the FEL bucket 30 can be replaced by a different typeof work implement, such as a forklift implement or a bale spear, inalternative embodiments of the tractor 20. Furthermore, in alternativeembodiments, a second type of work implement can be mounted to the rearof the tractor 20, such as a backhoe, and potentially also controlledutilizing the below-described variable track joystick device.

In the example of FIG. 1, the boom assembly 32 includes an aft bracket34 affixed to the tractor body 28, a forward bracket 36 to which thework implement 30 is pivotally attached, and an intermediate or midbracket 38 between the brackets 34, 36. Twin lift arms 40 (one of whichcan be seen in FIG. 1) pivotally attach the aft bracket 34 to the midbracket 38, which is, in turn, attached to the forward bracket 36 bytwin bucket arms 42 (again only one of which can be seen). Twinhydraulic lift cylinders 44 are further mounted between the aft bracket34 and the mid bracket 38, while twin hydraulic bucket cylinders 46 aremounted between the mid bracket 38 and the forward bracket 36. When theFEL system 24 is mounted to the front end of the tractor body 28,non-illustrated hydraulic lines of the FEL system 24 are fluidlyconnected to a pressurized hydraulic fluid supply on the tractor 20 in amanner permitting an operator seated within the operator station 26 tocontrol the hydraulic cylinders 44, 46.

An operator can command the boom assembly 32 to lift the FEL bucket 30by controlling the hydraulic lift cylinders 44 to extend. As thehydraulic lift cylinders 44 extend, the FEL bucket 30 is lifted from theground position shown in FIG. 1, travels through an intermediate or mastlevel position, and is raised to a full height position. Similarly, asthe hydraulic bucket cylinders 46 retract in response to operatorcommands, the boom assembly 32 tilts the FEL bucket 30 from theforward-facing open or scoop position (shown in FIG. 1), through anintermediate position, and to the upright position. Conversely, from thefull height position, the operator can control the boom assembly 32 tostroke the hydraulic cylinders 44, 46 in a manner opposite that justdescribed to return the FEL bucket 30 to the grounded, scoop positionshown in FIG. 1. The operator may control the cylinders 44, 46 to extendand retract, as desired, through movement of a joystick included in avariable track joystick device located within the operator station 26 ofthe tractor 20, as further discussed below in connection with FIG. 2.

Turning to FIG. 2, a number of the components or systems suitablyincluded in the tractor 20 and controlled utilizing a variable trackjoystick device 48 are schematically presented, as illustrated inaccordance with an embodiment of the present disclosure. As shown on theright side of this drawing figure, the work vehicle functions 49controlled utilizing the example variable track joystick device 48 mayinclude: (i) functioning of a work vehicle transmission 50 contained ina joystick-controlled transmission system 52, and (ii) movement of awork implement 54 contained in a joystick-controlled work implementsystem 56. Correlating FIG. 2 with FIG. 1, the work vehicle transmission50 shown in FIG. 2 may correspond to dashed box 22 in FIG. 1, while thework implement 54 and the joystick-controlled work implement system 56shown in FIG. 2 correspond to the FEL bucket 30 and the FEL system 24shown in FIG. 1, respectively.

Among other components, the variable track joystick device 48 includes aat least one processor or controller 58. The controller 58 implements oreffectuates operator commands by transmitting corresponding signals toactuators, such as control valves or electric actuators, included in thesystems controlled utilizing the variable track joystick device 48.Thus, in the example of FIG. 2, the controller 58 may transmit signalsto any number of actuators 60 contained in the transmission system 52 toeffectuate operator commands received via the variable track joystickdevice 48. Similarly, the controller 58 likewise transmits commandssignals to any number of actuators 62 contained in the work implementsystem 56 to effectuate operator commands when received via the joystickdevice 48. The signals transmitted to the actuators 60, 62 can behydraulic, pneumatic, or electric (wired or wireless) in nature,depending upon actuator type. For example, in the case of the FEL system24 (FIG. 1), the controller 58 may transmit electrical signals to valvecontrollers, which, in turn, vary hydraulic fluid flow to the hydrauliccylinders 44, 46 (corresponding to the actuators 62 in FIG. 2) toimplement operator input commands received via the joystick device 48.Various other control schemes are also possible, with the embodiment ofFIG. 2 merely serving as one generalized example.

While represented in FIG. 2 by a single box and referred to as a“controller” for convenience of reference, the controller 58 can includeone or more processors and other components, such as printed circuitboards and memory structures, which collectively perform the signalprocessing and control functions described herein. Generally, then, theterm “controller” broadly encompasses any number and type of processors,possibly in addition to other microelectronic components or logicstructures, which are operably interconnected to provide the processingcapabilities of the variable track joystick device 48. The controller 58may also include memory containing computer-readable instructions andlogic, as appropriate. Any such computer-readable instructions and logicmay be realized in any combination of hardware, firmware, and software,potentially including software programs or applications directing thevarious hardware features of the variable track joystick device 48 toperform the functions described throughout this document when executed.The controller 58 may be contained within the support housing 68, asgenerally indicated in schematic of FIG. 2. Alternatively, thecontroller 58 (and various other components of the variable trackjoystick device 48) can be situated outside of the support housing 68 infurther embodiments of the joystick device 48.

In addition to the controller 58, the variable track joystick device 48further includes a joystick 64, 66, which is mounted to a supporthousing 68 for movement with respect thereto. The joystick 64, 66includes, in turn, a joystick handle 64 and a joystick base 66. Thejoystick handle 64 projects from the support housing 68 in, for example,a generally upward direction to allow an operator seated within operatorstation 26 of the tractor 20 (FIG. 1) to comfortably grasp andmanipulate the handle portion 64 of the joystick 64, 66 when pilotingthe tractor 20. The joystick base 66 is fixedly joined to the joystickhandle 64 and located within the support housing 68. The joystick base66 is mounted to the support housing 68 by a coupling or joint, whichpermits movement of the joystick 64, 66 in at least one and, preferably,multiple degrees of freedom. As just stated, the joystick base 66 isrigidly joined to the joystick handle 64 such that the joystick base 66and the joystick handle 64 move as a single unit or rigid body. Incertain embodiments, portions of the joystick handle 64 and the joystickbase 66 may be integrally formed as single piece. The construction ofthe joystick 64, 66 is, however, largely inconsequential to the presentdisclosure, providing that the joystick 64, 66 can be rotated orotherwise moved relative to the support housing 68 in one or moredegrees of freedom, as discussed below.

Any number of sensors 70 may be included in the variable track joystickdevice 48, distributed through the support housing 68, and coupled insignal communication with the controller 58. Certain ones of the sensors70 are utilized to monitor movement of the joystick 64, 66 relative tothe support housing 68 and, therefore, relative to a spatial frame ofreference fixed relative to the operator station 26 of tractor 20 (FIG.1). Various different optical and non-optical sensors or transformerscan be utilized for this purpose. The sensors 70 of joystick device 48may further include any number and type of physical inputs present onthe joystick handle 64, on the exterior of the support housing 68, or onany other operator-accessible surface of the variable track joystickdevice 48. In many instances, such additional sensors 70 will includeone or more buttons, switches, dials, or the like, which can be selectedor otherwise manipulated by an operator when utilized the variable trackjoystick device 48 to further control the work vehicle functions 48 or,perhaps, other non-joystick-controlled functions of the tractor 20.Examples of such additional sensors 70 are shown in the upper leftcorner of FIG. 2 as a button cluster 72 positioned for convenientengagement by an operator's thumb when grasping the joystick handle 64.

When present on the exterior of the joystick handle 64, or possibly onanother surface of the joystick device 48, the button cluster 72 mayinclude a button 74 for switching between the operational modes of thevariable track joystick device 48; e.g., in the present example, forswitching between the below-described transmission control mode and theFEL control mode of the joystick device 48. In other instances, adifferent mechanism may be provided for switching between the variabletrack joystick device 48 in addition to or in lieu of the physicalbutton 74. For example, the variable track joystick device 48 mayfurther include one or more input devices 76 separate and apart from thejoystick input sensors 70, which enable an operator to switch betweenthe operational modes of the joystick device 48. In this latter case,the other operator input controls 76 may be physical in nature or,instead, may assume another form; e.g., a voice input interface or agraphical user interface (GUI) selection option presented on anon-illustrated display screen. In the latter regard, an operator of thetractor 20 may select the operational mode of the joystick device 48 bynavigating through a GUI utilizing an appropriate input device (e.g., acursor device or by touch input) and then selecting a widget controllingthe mode selection. In this and other instances, the variable trackjoystick device 48 may normally operate in a default modality (e.g., thebelow-described transmission control modality) and transition to thesecond modality (or, perhaps, a still further modality) when selectedvia operator input. If desired, the controller 58 may also be configuredto return the variable track joystick device 48 to a default modality,such as the below-described transmission control modality, upon tractorshutdown or startup.

The example variable track joystick device 48 further contains ajoystick guidance mechanism 78. As appearing herein, the term “joystickguidance mechanism” refers to any mechanism or device controllable toselectively limit or confine the ROM of a joystick in a predeterminedmanner; e.g., such that the desired confinement of the joystick movementto at least one predetermined track pattern can be applied and removed,as appropriate. In the illustrated example, the joystick guidancemechanism 78 includes one or more movable guide members 80, which can bemoved relative to the joystick base 66 by an actuator 82 to selectivelyblock rotation of the joystick 64, 66, and, specifically, movement ofthe joystick base 66 within the support housing 68. In other instances,and as discussed below, the joystick guidance mechanism 78 mayselectively confine joystick movement to one or more predetermined trackpatterns in a different manner; e.g., utilizing an electromagneticjoystick guidance scheme in which the controller 58 selectivelyenergizes an array of electromagnetics to confine movement of thejoystick 64, 66 to one or more fixed-track patterns (and, perhaps, otherlimited ROMs) when so desired. In such alternative implementations, thejoystick guidance mechanism 78 may lack the movable guide member(s) 80.

Progressing to FIGS. 3-6, a simplified example implementation of thevariable track joystick device 48 is presented, with like referencenumerals carried-over from FIG. 2 to FIGS. 3-6 (and the other drawingfigures) for ease of reference. The implementation of the variable trackjoystick device 48 shown in FIGS. 3-6 is provided by way of non-limitingexample only, again noting that the joystick device 48 is shown in asimplified form for purposes of explanation. For example, it can be seenthat the variable track joystick device 48 includes a joystick 64, 66mounted for movement relative to a base structure or support housing 68.The joystick 64, 66 is shown in a generalized, “cartoon” form includinga stick-like joystick handle 64 partially shown and lacking buttons orother inputs for illustrative clarity. A more realistic depiction of amore complex, contoured form that may be assumed by the joystick handle64 in a real-world implementation is shown in the upper left corner ofFIG. 2, as previously described.

As is the joystick 64, 66, the support housing 68 of the variable trackjoystick device 48 is shown in a simplified, box-like form in FIGS. 3and 4, which lacks various brackets, fasteners, and the like. Further, awall of the support housing 68 is hidden from view in FIGS. 3 and 4 (andthe support housing 68 is entirely hidden from view in FIGS. 5 and 6) toreveal the interior compartments and components of the example joystickdevice 48. In other implementations, the support housing 68 may assumevarious other forms, which will typically be more complex and contouredfor aesthetic integration into the surrounding facia of the operatorstation 26. The variable track joystick device 48 will also includevarious other features in actual implementations, such sensors formonitoring joystick position (corresponding to the sensors 70 labeled inFIG. 2) and/or one or more springs for biasing the joystick 64, 66toward the centered or home position discussed below.

As briefly indicated above, a multi-DOF coupling is provided between thejoystick 64, 66 and the support housing 68. In the example of FIGS. 3-6,the multi-DOF coupling assumes the form of a ball-and-socket jointformed between a generally spherical region 84 of the joystick base 66and walls 86, 88 of the support housing 68. Accordingly, the supporthousing may include an upper wall or cover plate 86 through which afirst central aperture or opening 90 is provided. Additionally, thesupport housing 68 may include an inner wall 88 (herein, the “innercradle wall” 88), which is located beneath the cover plate 86 and whichlikewise includes a central opening 92 formed therethrough. The openings90, 92 formed through the cover plate 86 and the inner cradle wall 88are substantially co-axial along a centerline or longitudinal axis 94 ofthe joystick 64, 66, as considered when in the centered or homeposition; that is, the non-displaced position shown in FIGS. 3, 5, and6. The cover plate 86 and the inner cradle wall 88, along with thesidewalls 96 of the support housing 68, cooperate to define a firstcompartment 98 in which the generally spherical region 84 of thejoystick 64, 66 resides.

The respective diameters of the openings 90, 92 are less than themaximum diameter of the generally spherical region 84 of the joystickbase 66. The generally spherical region 84 is thus physically capturedbetween the cover plate 86 and the inner cradle wall 88 when thevariable track joystick device 48 is assembled. Concurrently, due to theball-and-socket construction of this interface, the generally sphericalregion 84 and, more generally, the joystick 64, 66 is able to rotaterelative to the support housing 68 about two rotational axes 100, 102,as identified in FIGS. 5 and 6. The rotational axes 100, 102 areperpendicular and intersect at a center-point of the generally sphericalregion 84. Consequently, absent additional mechanical guidance orinterference, the joystick 64, 66 can rotate freely about the rotationalaxes 100, 102 and thereby move relative to the support housing 68. Suchfree rotation may continue in a given direction until a lower portion ofthe joystick handle 64 is brought into contact with an edge of the coverplate 86 adjacent the central opening 90 formed therein. When thejoystick 64, 66 is movable across the maximum range of motion permittedby the multi-DOF coupling between the joystick base 66 and the supporthousing 86 (unfettered by physical interface provided by the guidemembers 80-1, 80-2), the joystick 64, 66 may be described as beingmovable over its open or full ROM.

In further embodiments, a different ball-and-socket coupling can beformed between the joystick 64, 66 and the support housing 68. Forexample, the support housing 68 can include a more complete or definedgenerally spherical cavity in certain implementations. In suchimplementations, the interior surfaces of the generally spherical cavitymay be studded with ball bearings or, instead, the exterior of thegenerally spherical region 84 can be studded with ball bearings tofacilitate movement of the joystick 64, 66 relative to the supporthousing 68. Alternatively, a low friction coating or sleeve may bepresent. Further, the generally spherical region 84 (and any associatedcavity) can be imparted with an increasing flattened or imperfectspherical shape, while still permitting rotation of the joystick 64, 66about the rotational axes 100, 102 (FIGS. 5 and 6). Various othermulti-DOF couplings are also possible and equally viable, providing thatthe joystick 64, 66 can rotate, slide, or otherwise move relative to thesupport housing 68 in at least two degrees of freedom. Such othermulti-DOF couplings are known in the context of joystick devices andinclude, but are not limited to, gimbal-type couplings and resilient(e.g., spring mount) couplings.

As previously mentioned, the joystick guidance mechanism 78 includes atleast one moveable guide member 80 mechanically linked to an actuator82, either directly or indirectly through any number of interveningcomponents. The guide member(s) 80 and the actuator 82 can assumevarious forms suitable for selectively confining movement of thejoystick 64, 66 to a fixed-track pattern in response to commandsreceived from the controller 58 (FIG. 1). In the example of FIGS. 3-6,specifically, the joystick guidance mechanism 78 includes two suchmovable guide members 80-1, 80-2, which are selectively moved betweenpredefined positions by the actuator 82 located in a lower compartment104 of the support housing 68. The actuator 82 is controllable toselectively move the guide members 80-1, 80-2 between a blockingposition (shown in FIGS. 3 and 5) and a non-blocking position (shown inFIGS. 4 and 6). When in the blocking position, the guide members 80-1,80-2 encroach into the ROM of the joystick base 66 to restrict rotationof the joystick 64, 66 to a fixed-track pattern, as discussed below inconnection with FIG. 9. The blocking position of the guide members 80-1,80-2 thus corresponds to the first (transmission control) mode in theillustrated example. Conversely, when in the non-blocking positioncorresponding to the second (FEL control) mode of the variable trackjoystick device 48, the guide members 80-1, 80-2 may be positionedoutside of the ROM of the joystick base 66, as described below inconnection with FIG. 10. As a result, movement of the joystick 64, 66beyond the predetermined track pattern is enabled, perhaps over the fullor open ROM of the joystick device 48 permitted by the multi-DOFcoupling between the joystick base 66 and the support housing 68.

The actuator 82 of the joystick guidance mechanism 78 can assume variousforms for moving the guide members 80-1, 80-2 between the blocking andnon-blocking positions in response to commands received from thecontroller 58 (FIG. 2). In the illustrated example, the actuator 82assumes the form of an electric actuator having a housing or body 106, arotatable output shaft extending from the actuator body 106, and a gearor pinion 108 mounted to the outer terminal end of the output shaft.Input/Output (I/O) terminals 110 project from a side of the actuator 82for connection to the controller 58 (FIG. 2) utilizing suitable wires orother connectors, which may pass through an opening 112 provided in oneof the sidewalls 96 of the support housing 68 (FIGS. 3 and 4). Thepinion 108 is engaged on opposing sides by two toothed racks 114-1,114-2, which are affixed to the guide members 80-1, 80-2, respectively.As the toothed racks 114-1, 114-2 are placed in mesh engagement withopposing sides of the pinion 108 such that the racks 114-1, 114-2, thetoothed racks 114-1, 114-2 translate in opposing directions withrotation of the pinion 108. Further, as the racks 114-1, 114-2 areaffixed to the guide members 80-1, 80-2, rotation of the pinion 108causes divergent or convergent movement of the guide members 80-1, 80-2along a translational axis (parallel to axis 100 identified in FIGS. 5and 6). The guide members 80-1, 80-2 diverge or converge away from ortoward, as the case may be, the centerline or longitudinal axis of thejoystick 64, 66 (and the below-described lower joystick extension 128)when the joystick 64, 66 is in the home or neutral position. The guidemembers 80-1, 80-2 may slide along one or more rails 116 (one of whichcan be seen in FIGS. 3 and 4) when driven by rotation of the pinion 108.Non-illustrated bearings or low friction coatings may also be providedto facilitate low friction movement of the guide members 80-1, 80-2, ifdesired.

A dual rack-and-pinion arrangement is thus utilized to mechanically linkthe output of the actuator 82 to the guide members 80-1, 80-2 in theillustrated example, thereby providing convergent or divergent movementof the guide members 80-1, 80-2 in a synchronized manner. In furtherembodiments, a different mechanical linkage or system can be utilized tocouple the output of the actuator 82 to the guide members 80-1, 80-2,while driving such convergent or divergent movement; e.g., a systemincluding flexible linkages (e.g., belts or cables), a scissor linkage,a shaft having twin opposing threads engaged by two or more nuts, or thelike may be utilized for this purpose. Further, the joystick guidancemechanism 78 need not include two guide members 80-1, 80-2, whichundergo convergent or divergent movement in all embodiments of thepresent disclosure. Instead, in further embodiments, a single guidemember similar to the combination of guide members 80-1, 80-2 could bepositioned beneath the generally spherical region 84 of the joystick 64,66 and moved vertically upward or downward to restrict joystick movementof the predetermined track pattern when desired. Other embodiments ofthe variable track joystick device 48 can incorporate cable-and-reelmechanisms to selectively confine joystick movement; e.g., by attachingcables to different points of the generally spherical region 84 of thejoystick 64, 66 and selectively resisting cable let-out utilizing reelmechanisms in a manner similar to certain Artificial Force Feedback(AFF) arrangements. Various other arrangements are also possible.

The guide members 80-1, 80-2 are further shown in FIGS. 7 and 8 in theblocking and non-blocking positions, respectively. In the blockingposition shown in FIG. 7, the guide members 80-1, 80-2 are brought intoclose proximity and may (but need not necessarily) contact along aninterface 134 (identified in FIG. 9). Notably, the guide member 80-1 hasa block-like body 118-1 in which a first portion of a fixed-trackpattern 120-1 is formed. So too does the guide member 80-2 have ablock-like body 118-2 in which a second portion of a fixed-track pattern120-2 is provided. The fixed-track pattern portions 120-1, 120-2 aredefined by a number of intersecting grooves or open channels 122, 124,126 formed in the bodies 118-1, 118-2 of the guide members 80-1, 80-2.When moved into the blocking position shown in FIG. 7, the fixed-trackpattern portion 120-1 combines with the fixed-track pattern portion120-2 to form a complete fixed-track pattern 120. The fixed-trackpattern 120 can have various different geometries and dimensions, whichmay vary depending upon various factors including, for example, the workvehicle function controlled with the variable track joystick device 48when operating in the mode corresponding to the blocking position of themovable guide members 80-1, 80-2.

Referring collectively to FIGS. 3-8, and shown most clearly in FIGS. 5and 6, the joystick base 66 further includes a lower joystick extension128 (colloquially, a “tail” or “stinger”) opposite the joystick handle64. The lower joystick extension 128 of the joystick 64 travels in thefixed-track pattern 120-1 when the joystick 64, 66 is manipulated by anoperator and the guide members 80-1, 80-2 are moved into the blockingposition shown in FIG. 7. The lower joystick extension 128 has arod-like or post-like shape, which extends from the generally sphericalregion 84 opposite the joystick handle 64 and may be substantiallyco-axial therewith. The lower joystick extension 128 may be rigidlycoupled to the joystick handle 64, whether formed as a single piece orassembled from any number of components. The lower joystick extension128 thus also rotates about the axes 100, 102 (FIGS. 5 and 6) along withrotation of the joystick handle 64, although the movement of the lowerjoystick extension 128 will generally be opposite that of the joystickhandle 64 (considered as looking down onto the joystick 48 along axis94) as the lower joystick extension 128 is located at the opposing endor pole of the spherical region 84 of the joystick 64, 66.

The manner in which the guide members 80-1, 80-2 are moved between theblocking and non-blocking positions to selectively restrict movement ofthe joystick 64, 66 is further illustrated in FIGS. 9 and 10. Convergentmovement of the guide members 80-1, 80-2 from the non-blocking positioninto the blocking position is represented in FIG. 9 by arrows 130.Conversely, divergent movement of the guide members 80-1, 80-2 from theblocking position into the non-blocking position is represented in FIG.10 by arrows 132. When moved into the blocking position (FIG. 9), theguide members 80-1, 80-2 may contact, or at least come into closeproximity, along the interface 134, as previously noted. The lowerjoystick extension 128 is further shown in FIGS. 9 and 10, as is thelongitudinal axis 94 of the joystick 64, 66 when in the centered,non-displaced, or home position shown in FIGS. 3, 5, and 6. Thus, inthese positions, the lower joystick extension 128 remains centered at alocation vertically below the center-point of the generically sphericalregion 84 of the joystick 64, 66 at which axes 100, 102 (FIGS. 5 and 6)intersect. For comparison, the dashed circle 136 shown in FIG. 10 marksthe location into which the lower joystick extension 128 is moved whenthe joystick 64, 66 is rotated into the position shown in FIG. 4.

A key 138 appears at the bottom of FIGS. 9 and 10 and indicates the fill(cross-hatch and dot stippling) patterns denoting the lower joystickextension 128, the sidewalls of the guide members 80-1, 80-2, and theROM of the lower joystick extension 128 in the first mode (FIG. 9) andthe second mode (FIG. 10). Here, the ROM of the lower joystick extension128 will generally correspond to the ROM of the joystick handle 64 andthe joystick 64, 66. However, it should be appreciated that, due to thedisparity between the length of the lower joystick extension 128 and thejoystick handle 64, the ROM of the joystick handle 64 (considered at thetopmost point of the handle 64) will be magnified relative to the ROM ofthe lower joystick extension 128. Additionally, as the joystick handle64 and the lower joystick extension 128 are position on opposing sidesof (as polar opposites relative to) the generally spherical region 84,the movement of the joystick handle 64 will generally be the inverse ofthe movement of the lower joystick extension 128 considered from a topview looking downward onto the joystick device 48; that is, as viewedalong an axis co-axial with the longitudinal axis 94 when in thejoystick 64, 66 is in the normal or home position.

Addressing FIG. 9 in greater detail, rotation of the joystick 64, 66about the axes 100, 102 (FIGS. 5 and 6) is permitted only to the extentallowed by the physical interaction between the lower joystick extension128 and the fixed-track pattern 120 formed by the guide members 80-1,80-2 when in the blocking position. For convenience of reference, themovement of the lower joystick extension 128 will be described assliding movement or travel of the lower joystick extension 128 withinthe linear tracks 122, 124, 126 forming the fixed-track pattern 120, asdiscussed below with reference to coordinate legend 140 appearing inFIG. 9. It will be understood, however, that such “sliding movement” or“travel” of the lower joystick extension 128 within the linear tracks122, 124, 126 is due to rotation of the lower joystick extension 128and, more generally, the joystick 64, 66 about the rotational axes 100,102 (FIGS. 5 and 6) defined by the ball-and-socket interface createdbetween the generally spherical region of 84 of the joystick 64, 66 andthe walls 86, 88 of the support housing 68, as previously described inconnection with FIGS. 3 and 4.

As stated above, the particular pattern or geometry of the fixed-trackpattern 120 will vary embodiments, as will the manner in which joystickmovement along the fixed-track pattern 120 affects the work vehiclefunction controlled when the joystick device 48 operates in the firstmode. In the present example, the fixed-track pattern 120 may bedescribed as principally formed by a plus-shaped or cross-shaped(cruciform) central portion defined by linear tracks 122, 124. The lefthalf 122-1 of the linear track 122 is defined by a slot or open channelformed in the guide member 80-1, while the right half 122-2 of thelinear track 122 is defined by a slot or channel formed in the guidemember 80-2. Similarly, approximately half of linear track 124(hereafter, “left wing 124-1”) is defined by a slot or open channelformed in the guide member 80-1, while the left half 124-2 (hereafter,“right wing 124-2”) of the linear track 124 is defined by a slot orchannel formed in the guide member 80-2. Here, the tracks 122, 124 havesubstantially linear or straight geometries and form a perpendicularangle relative to one another. In other embodiments, the tracks 122, 124may intersect at a different angle or have different shapes, such as aslightly bowed or curved geometry.

With continued reference to FIG. 9, the fixed-track pattern 120 furtherincludes a third linear track 126 defined by a slot or open channel,which is formed entirely in the guide member 80-1. The third lineartrack 126 is intersected by the left wing 124-1 of linear track 124formed in the guide member 80-1. When the variable track joystick device48 is selectively utilized to control the transmission of tractor 20(FIG. 1) or another work vehicle when operating in the first mode, thethird linear track 126 may be provided for so-called “creep control”;that is, for relatively fine, small increment speed adjustments over alimited speed range suitable for slowly navigating the tractor 20 in aforward or backward direction. This may useful when, for example, animplement is attached or detached from the front or rear end of thetractor 20. In other instances, the third linear track 126 may differ ingeometry or location (e.g., be repositioned to the end of the portion124-2 of the linear track 124) or may be omitted entirely.

By way of non-limiting example, the transmission of the tractor 20 maybe controlled as follows when the joystick device 48 is placed in thefirst, transmission control mode (FIG. 9). Beginning from the homeposition shown in FIG. 9, rotation of the joystick handle 64 in aforward direction (away from the body of an operator and generallycorresponding rotation about axis 100 in a first direction) results inmovement of the lower joystick extension 128 in a rearward directiongenerally along the Y-axis of legend 140. Certain ones of sensors 70detect this movement and send corresponding signals to the controller58, which then provides the appropriate signals to transmissionactuators 60 (FIG. 2) to translate the operator commands intooperational changes within the tractor transmission 50. In thisinstance, rotation of the joystick handle 64 in the forward directionmay cause the tractor 20 to accelerate, with the degree of accelerationincreasing with increasing displacement of the joystick handle 64 awayfrom the home position. Conversely, rotation of the joystick in arearward direction (toward the body of the operator and corresponding torotation about axis 100 in a second direction) results in movement ofthe lower joystick extension 128 in a forward direction (upward alongthe Y-axis of legend 140 in the orientation shown in FIG. 9). Suchmotion is detected by the sensors 70, reported to the controller 58, andthen translated into deceleration of the tractor transmission 50.

Again beginning from the home position shown in FIG. 9, rotation of thejoystick handle 64 to the left in FIG. 9 (corresponding to rotationabout axis 102 in a first direction) results in movement of the lowerjoystick extension 128 to the right and, thus, into the wing 124-2 ofthe linear track 124. This may be detected by the sensors 70, reportedto the controller 58, and then controller 58 may convert such movementof the joystick 64, 66 into an operator command to set the active speedof the tractor. Finally, rotation of the joystick handle 64 to the leftin FIG. 9 (corresponding to rotation about axis 102 in a seconddirection) results in movement of the lower joystick extension 128 tothe right, with the lower joystick extension 128 traveling into the wing124-1 of the linear track 124. From here, the operator may move thejoystick 64, 66 to cause the lower joystick extension 128 to enter thelinear track 126. Forward movement of the joystick 64, 66 from thisposition results in travel of the lower joystick extension 128 into thelower portion of the track 126 shown in FIG. 9 and limited speedincrease in the crawling mode of the tractor transmission 50.Conversely, rearward movement of the joystick 64, 66 from this positionthe mid-portion of the track 126 intersected by the wing 124-1) resultsin travel of the lower joystick extension 128 into the upper portion ofthe track 126 shown in FIG. 9 and limited speed decrease in the crawlingmode of the tractor transmission 20. In further embodiments, thelocation of the track 126 may be repositioned to the other side of thewing 124-2 such that an operator rotates the joystick handle 64 in theright direction to set the active speed of the tractor and in the leftposition to access the crawling function of the tractor 20.

Addressing lastly FIG. 10, in this scenario, the variable track joystickdevice 48 now operates in the second (loader control) mode in whichjoystick movement controls movement of the FEL system 24 (FIG. 1).Accordingly, the controller 58 has commanded the actuator 82 to move theguide member 80-1, 80-2 into the non-blocking position shown in FIG. 10.As indicated by arrows 132, the guide members 80-1, 80-2 have thusdiverged away from the axis 94 and no longer interfere (or interfere toa lesser extent) with movement of the lower joystick extension 128 overthe full ROM permitted by the joystick-housing coupling. Stateddifferently, when the guide members 80-1, 80-2 are moved into thenon-blocking position shown in FIG. 10, the guide members 80-1, 80-2 maybe displaced outside of (no longer encroach into) the ROM of the lowerjoystick extension 128. As indicated by the circular graphic 142, thelower joystick extension 128 can freely travel over a generally circularROM (as seen looking along the axis 94 when the joystick 64, 66 is inthe home position), with the outer boundaries of the ROM limited byinherent constraints of the coupling between the joystick 64, 66 and thesupport housing 68. The joystick handle 64 may thus rotated about eitheror both of axes 100, 102 (FIGS. 5 and 6) independent of the angularposition of the joystick 64, 66 limited only by the outer periphery ofthe maximum or full ROM boundary, represented by circle 142. Movement ofthe joystick 64, 66, including movement of the joystick base 66 andlower joystick extension 128, is thus not confined to any particulartrack pattern. This may again be appreciated by referring to theposition of the joystick 64, 66 in FIG. 4 and the corresponding positionof the lower joystick extension 128 identified in FIG. 10 by dashedcircle 136, noting that the lower joystick extension 128 cannot be movedinto this position due to the physical impediment provided by the guidemember 80-2 when in the blocking position shown in FIG. 9.

As was the case with the manner in which the joystick device 48 controlsthe tractor transmission 50. However, in one control scheme, movement ofthe joystick handle 64 in a forward direction (away from the body of anoperator), and thus movement of the lower joystick extension 128 in arearward direction, results in lowering of the FEL bucket 30 (FIG. 1).Conversely, movement of the joystick handle 64 in a rearward direction(toward the body of an operator), and corresponding movement of thelower joystick extension 128 in a forward direction, results in raisingthe FEL bucket 30 (FIG. 1). Movement of the joystick handle 64 to theleft, and corresponding movement of the lower joystick extension 128 tothe right, results in tilting of the FEL bucket 30 (FIG. 1) toward anupright or “closed” orientation. Finally, movement of the joystickhandle 64 to the right, and corresponding movement of the lower joystickextension 128 to the left, results in tilting of the FEL bucket 30(FIG. 1) toward a scoop or “open” position.

Additional Discussion of the Guide Member(S) Included in Embodiments ofthe Variable Track Joystick Device

In the above-described embodiment, selectively physical obstruction orblocking is utilized to selectively confine movement of the joystick toa predetermined track pattern when appropriate. Such selective physicalobstruction is accomplished by moving two guide members into and out ofthe ROM of a portion of the joystick. In other instances, a differentnumber of guide members may be utilized to restrict joystick motion,potentially with different sets of guide members moved into and out ofengagement with a lower portion of the joystick to restrict joystickmovement to different fixed-track pattern. Further, other types ofphysical guide members can be utilized to selectively restrict joystickmovement in embodiments including, for example, cable-and-reelmechanisms of the type previously described. In still further instances,electromagnetic sub-systems can be incorporated into the joystick deviceand utilized to selectively restrict joystick movement; e.g., throughthe usage of hydraulic cylinders, AFF motors, or the like, which can beselectively commanded to impede movement of the joystick by thecontroller in accordance with, for example, the above-described controlscheme. As another possibility, permanent magnets or points of variablereluctant may be provided around an outer, generally spherical region ofthe joystick similar to the generally spherical region 84 of thejoystick 64, 66 discussed above in connection with FIGS. 3-6.Electromagnets may further be distributed around a socket in which thegenerally spherical region is received to form a ball-and-socketcoupling. The electromagnets may then be selectively energized by acontroller, when appropriate, to restrict movement of the joystick to adesired fixed-track pattern. Such an electromagnetic sub-system may thusbe generally considered a “joystick guidance mechanism” in suchembodiments.

Enumerated Examples of Variable Track Joystick Devices for Usage withinWork Vehicles

The following examples of the variable track joystick device are furtherprovided, which are numbered for ease of reference.

1. In a first embodiment, a variable track joystick device is utilizedto control at least first and second work vehicle functions. Thevariable track joystick device includes a support housing, a joystickmovable with respect to the support housing, a joystick guidancemechanism coupled to the support housing and controllable to selectivelyconfine joystick movement to a predetermined track pattern, and acontroller operably coupled to the joystick guidance mechanism. Thecontroller is configured to: determine when the variable track joystickdevice is placed in a selected one of (i) a first mode in which joystickmovement controls the first work vehicle function and (ii) a second modein which joystick movement controls the second work vehicle function.The controller further command the joystick guidance mechanism torestrict joystick movement to the predetermined track pattern when thevariable track joystick device is placed in the first mode, whilepermitting joystick movement outside of the predetermined track patternwhen the variable track joystick device is placed in the second mode.

2. The variable track joystick device of example 1, wherein the firstwork vehicle function includes a transmission control function, whilethe second work vehicle function includes an implement control function.

3. The variable track joystick device of example 2, wherein theimplement control function includes a loader control function.

4. The variable track joystick device of example 1, wherein the joystickguidance mechanism restricts joystick movement to at least one lineartrack when confining joystick movement to the predetermined trackpattern.

5. The variable track joystick device of example 4, wherein the joystickguidance mechanism restricts joystick movement to multiple intersectinglinear tracks when confining joystick movement to the predeterminedtrack pattern.

6. The variable track joystick device of example 1, wherein the joystickis rotatable relative to the support housing about a first rotationalaxis and about a second rotational axis perpendicular to the firstrotational axis. Additionally, the joystick guidance mechanism mayrestrict joystick movement to at least first and second linear tracksparallel to the first and second rotational axes, respectively, whenconfining joystick movement to the predetermined track pattern.

7. The variable track joystick device of example 6, wherein the firstand second linear tracks intersect at a home position of the joystick.

8. The variable track joystick device of example 1, further including amode selection interface enabling an operator of the work vehicle toswitch between the first and second mode. Further, the controller maydetermine when the variable track joystick device is placed in aselected one of the first and second modes based, at least in part, onoperator input received via the mode selection interface.

9. The variable track joystick device of example 1, wherein the joystickincludes a joystick handle projecting from the support housing, ajoystick base received within the support housing, and a couplingbetween the joystick base and the support housing. The coupling permitsrotation of the joystick base over a full ROM.

10. The variable track joystick device of example 9, wherein thejoystick guidance mechanism includes at least one guide member withinthe support housing, as well as an actuator coupled to the at least oneguide member and to the controller. The actuator is configured toselectively move the at least one guide member into a blocking positionin which the at least one guide member physically prevents movement ofthe joystick base over the full ROM.

11. The variable track joystick device of example 1, wherein thejoystick guidance mechanism includes an actuator in signal communicationwith the controller. First and second guide members are disposed withinthe support housing and mechanically linked to the actuator. The firstand second guide members are movable between (i) a non-blocking positionand (ii) a blocking position in which the first and second guide membersphysically limit joystick movement to the predetermined track pattern.The controller commands the actuator to move the first and second guidemembers into the block positioning when the variable track joystickdevice is placed in the first mode and into non-blocking position whenthe variable track joystick device is placed in the second mode.

12. The variable track joystick device of example 11, wherein the firstand second guide members converge to define at least one linear trackwhen moving from the non-blocking position to the blocking position.

13. A variable track joystick device utilized onboard a work vehicle isfurther provided. The variable track joystick device includes a supporthousing, a joystick having a joystick base within the support housingand a joystick handle projecting from the support housing, a couplingformed between the joystick base and the support housing, and joystickguidance mechanism. The coupling permits rotation of the joystick baseover ROM relative to the support housing about first and secondperpendicular axes. The joystick guidance mechanism includes at leastone guide member coupled to the support housing and movable relative tothe joystick base. An actuator is coupled to the at least one guidemember and is controllable to selectively move the at least one guidemember between (i) a blocking position in which the at least one guidemember encroaches into the ROM of the joystick base to restrict joystickmovement, and (ii) a non-blocking position in which the at least oneguide member resides outside of the ROM of the joystick base.

14. The variable track joystick device of example 13, wherein the firstand second guide members converge to define at least one linear trackwhen moving from the non-blocking position to the blocking position.

15. The variable track joystick device of example 13, wherein thecoupling permits movement of the joystick handle over a generallycircular ROM centered on a home position of the joystick when the atleast one guide member is in the non-blocking position.

CONCLUSION

The foregoing has thus provided embodiments of a variable track joystickdevice well-suited for controlling multiple work vehicle functions,while selectively limiting joystick movement to at least onepredetermined track pattern as appropriate for controlling a particularwork vehicle function. In the above-described example embodiment, thevariable track joystick device is operable in two modes, each utilizedto control a different work vehicle function via joystick movement overdisparate ROMs. However, embodiments of the variable track joystickdevice can be operable in any practical number of modes and utilized tocontrol three or more work vehicle functions through joystick movement,with selective confinement of the joystick to any practical number oftrack patterns. Further, the manner in which joystick movement isselectively confined to the predetermined track pattern (or patterns)will vary among embodiments. In many instances, joystick movement willbe selectively limited to a predetermined track pattern (or trackpatterns) by selectively position one or more guide members tophysically interfere or block movement of a lower portion of thejoystick contained in the support housing, as previously described. Inalternative embodiments, however, other types of physical andnon-physical (e.g., electromagnetic) interfaces to selectively confinejoystick movement to the predetermined track pattern (or patterns) basedupon the operation mode of the variable track joystick device and thework vehicle function presently controlled utilizing the joystickdevice. Finally, while primary described above in connection with aparticular type of work vehicle (i.e., an FEL-equipped tractor),embodiments of the variable track joystick device are not restricted tocontrolling any particular set of work vehicle functions and can bedeployed within a wide array of work vehicle types utilized within theagricultural, mining, forestry, and construction industries.

As used herein, the singular forms “a”, “an,” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. It will be further understood that the terms “comprises”and/or “comprising,” when used in this specification, specify thepresence of stated features, integers, steps, operations, elements,and/or components, but do not preclude the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or groups thereof.

The description of the present disclosure has been presented forpurposes of illustration and description, but is not intended to beexhaustive or limited to the disclosure in the form disclosed. Manymodifications and variations will be apparent to those of ordinary skillin the art without departing from the scope and spirit of thedisclosure. Explicitly referenced embodiments herein were chosen anddescribed in order to best explain the principles of the disclosure andtheir practical application, and to enable others of ordinary skill inthe art to understand the disclosure and recognize many alternatives,modifications, and variations on the described example(s). Accordingly,various embodiments and implementations other than those explicitlydescribed are within the scope of the following claims.

What is claimed is:
 1. A variable track joystick device utilized tocontrol at least first and second work vehicle functions, the variabletrack joystick device comprising: a support housing; a joystick movablewith respect to the support housing; a joystick guidance mechanismcoupled to the support housing and controllable to selectively confinejoystick movement to a predetermined track pattern; and a controlleroperably coupled to the joystick guidance mechanism, the controllerconfigured to: determine when the variable track joystick device isplaced in a selected one of (i) a first mode in which joystick movementcontrols the first work vehicle function and (ii) a second mode in whichjoystick movement controls the second work vehicle function; and commandthe joystick guidance mechanism to restrict joystick movement to thepredetermined track pattern when the variable track joystick device isplaced in the first mode, while permitting joystick movement outside ofthe predetermined track pattern when the variable track joystick deviceis placed in the second mode.
 2. The variable track joystick device ofclaim 1, wherein the first work vehicle function comprises atransmission control function, while the second work vehicle functioncomprises an implement control function.
 3. The variable track joystickdevice of claim 2, wherein the implement control function comprises aloader control function.
 4. The variable track joystick device of claim1, wherein the joystick guidance mechanism restricts joystick movementto at least one linear track when confining joystick movement to thepredetermined track pattern.
 5. The variable track joystick device ofclaim 4, wherein the joystick guidance mechanism restricts joystickmovement to multiple intersecting linear tracks when confining joystickmovement to the predetermined track pattern.
 6. The variable trackjoystick device of claim 1, wherein the joystick is rotatable relativeto the support housing about a first rotational axis and about a secondrotational axis perpendicular to the first rotational axis; and whereinthe joystick guidance mechanism restricts joystick movement to at leastfirst and second linear tracks parallel to the first and secondrotational axes, respectively, when confining joystick movement to thepredetermined track pattern.
 7. The variable track joystick device ofclaim 6, wherein the first and second linear tracks intersect at a homeposition of the joystick.
 8. The variable track joystick device of claim1, further comprising a mode selection interface enabling an operator ofthe work vehicle to switch between the first and second modes; andwherein the controller determines when the variable track joystickdevice is placed in a selected one of the first and second modes based,at least in part, on operator input received via the mode selectioninterface.
 9. The variable track joystick device of claim 1, wherein thejoystick comprises: a joystick handle projecting from the supporthousing; a joystick base received within the support housing; and acoupling between the joystick base and the support housing, the couplingpermitting rotation of the joystick base over a full Range of Motion(ROM).
 10. The variable track joystick device of claim 9, wherein thejoystick guidance mechanism comprises: at least one guide member withinthe support housing; and an actuator coupled to the at least one guidemember and to the controller, the actuator configured to selectivelymove the at least one guide member into a blocking position in which theat least one guide member physically prevents movement of the joystickbase over the full ROM.
 11. The variable track joystick device of claim1, wherein the joystick guidance mechanism comprises: an actuator insignal communication with the controller; first and second guide memberswithin the support housing and mechanically linked to the actuator, thefirst and second guide members movable between (i) a non-blockingposition and (ii) a blocking position in which the first and secondguide members physically limit joystick movement to the predeterminedtrack pattern; wherein the controller commands the actuator to move thefirst and second guide members into the block positioning when thevariable track joystick device is placed in the first mode and intonon-blocking position when the variable track joystick device is placedin the second mode.
 12. The variable track joystick device of claim 11,wherein the first and second guide members converge to define at leastone linear track when moving from the non-blocking position to theblocking position.
 13. A variable track joystick device utilized onboarda work vehicle, the variable track joystick device comprising: a supporthousing; a joystick having a joystick base located within the supporthousing and a joystick handle projecting from the support housing; acoupling provided between the joystick base and the support housing, thecoupling permitting rotation of the joystick base over a Range of Motion(ROM) relative to the support housing about first and secondperpendicular axes; and a joystick guidance mechanism, comprising: atleast one guide member coupled to the support housing and movablerelative to the joystick base; and an actuator mechanically linked tothe at least one guide member and controllable to selectively move theat least one guide member between (i) a blocking position in which theat least one guide member encroaches into the ROM of the joystick baseto restrict joystick movement, and (ii) a non-blocking position in whichthe at least one guide member resides outside of the ROM of the joystickbase.
 14. The variable track joystick device of claim 13, wherein thefirst and second guide members converge to define at least one lineartrack when moving from the non-blocking position to the blockingposition.
 15. The variable track joystick device of claim 13, whereinthe coupling permits movement of the joystick handle over a generallycircular ROM centered on a home position of the joystick when the atleast one guide member is in the non-blocking position.
 16. The variabletrack joystick device of claim 13, wherein the work vehicle comprises atransmission and a work implement; and wherein the variable trackjoystick device further comprises a controller in single communicationwith the actuator, the controller configured to: determine when thevariable track joystick device is placed in a selected one of (i) afirst mode in which joystick movement controls functioning of thetransmission and (ii) a second mode in which joystick movement controlsfunctioning of the work implement; and command the actuator to move theat least one guide member into the blocking position when the variabletrack joystick is placed in the first mode and into the non-blockingposition when the variable track joystick is placed in the second mode.17. A work vehicle comprising: a transmission; a work implement; and avariable track joystick device comprising: a support housing; a joystickmovable with respect to the support housing; a joystick guidancemechanism coupled to the support housing and controllable to selectivelyconfine joystick movement to a predetermined track pattern; and acontroller operably coupled to the joystick guidance mechanism, thecontroller configured to: determine when the variable track joystickdevice is placed in a selected one of (i) a transmission control mode inwhich joystick movement controls functioning of the transmission and(ii) a work implement control mode in which joystick movement controlsfunctioning of the work implement; and command the joystick guidancemechanism to restrict joystick movement to the predetermined trackpattern when the variable track joystick device is placed in thetransmission control mode, while permitting joystick movement outside ofthe predetermined track pattern when the variable track joystick deviceis placed in the work implement control mode.
 18. The work vehicle ofclaim 17, wherein the joystick guidance mechanism restricts joystickmovement to multiple intersecting linear tracks when confining joystickmovement to the predetermined track pattern.
 19. The work vehicle ofclaim 17, wherein the work implement comprises a loader, and wherein thework implement control mode comprises a loader control mode.
 20. Thework vehicle of claim 18, wherein the joystick guidance mechanismcomprises: at least one guide member movably coupled to the supporthousing; and an actuator coupled to the at least one guide member andcontrollable to selectively move the at least one guide member between(i) a blocking position in which the at least one guide memberencroaches into the ROM of the joystick base to restrict joystickmovement, and (ii) a non-blocking position in which the at least oneguide member resides outside of the ROM of the joystick base; whereinthe controller commands the actuator to move the at least one guidemember into the blocking position when the variable track joystick isplaced in the transmission control mode and into the non-blockingposition when the variable track joystick is placed in the workimplement control mode.